001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.gravity.selector;
023
024import javax.jms.JMSException;
025
026import flex.messaging.messages.Message;
027
028/**
029 * Represents a property  expression
030 *
031 * @version $Revision: 1.5 $
032 */
033public class PropertyExpression implements Expression {
034
035    interface SubExpression {
036        public Object evaluate(Message message);
037    }
038
039    private final String name;
040
041    public PropertyExpression(String name) {
042        this.name = name;
043    }
044
045    public Object evaluate(MessageEvaluationContext message) throws JMSException {
046        return message.getMessage().getHeader(name);
047    }
048
049    public Object evaluate(Message message) {
050        return message.getHeader(name);
051    }
052
053    public String getName() {
054        return name;
055    }
056
057
058    /**
059     * @see java.lang.Object#toString()
060     */
061    @Override
062    public String toString() {
063        return name;
064    }
065
066    /**
067     * @see java.lang.Object#hashCode()
068     */
069    @Override
070    public int hashCode() {
071        return name.hashCode();
072    }
073
074    /**
075     * @see java.lang.Object#equals(java.lang.Object)
076     */
077    @Override
078    public boolean equals(Object o) {
079
080        if (o == null || !this.getClass().equals(o.getClass())) {
081            return false;
082        }
083        return name.equals(((PropertyExpression) o).name);
084
085    }
086
087}